<template>
  <div class="app-container">
    <div class="menu">
      menu1
      <div>
        menu1-2
        <div>menu-1-2-1</div>
      </div>
    </div>
  </div>
</template>
<style lang="scss" scoped>
div {
  padding: 10px;
}

.menu {
  background: #f4f4f5;

  div {
    background: lightblue;

    div {
      background: lightgreen;
    }
  }
}
</style>
